By advertising, I mean mass-market advertising combined with marketing, not slogans painted on a wall in ancient Greece or Babylon. American marketing has progressed enormously from the days of "none genuine without this signature" and "accept no substitutes' days.
Products are designed to sell to a particular audience, and marketed accordingly. Salton had been making cheapo home grills for eons, but some marketing expert discovered that there was a very large market segment that was not buying them that coincidentally identified with George Foreman, and the rest is history.
Neons came in magenta because women like magenta cars.